To mow the whole lawn took four hours.
Bold word is infinitive phrases
To mow the whole lawn is taking four hours → gerund form
In an infinitive phrase, the modifiers might include articles, adjectives, objects, or adverbs. An infinitive phrase begins with the infinitive verb, usually with the word "to" in front. Here are some examples of infinitive phrases: Peter loved to play guitar
A gerund is that the –ing form of a verb that functions the same as a noun. for example, “Running is fun.” during this sentence, “running” is that the gerund. It acts a bit like a noun
Learn more about gerund form :
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